BLCD title? Ex-girlfriend as an important character

[Xio007]

I'm looking for a blcd I listened years ago. The seme helped his ex girlfriend who is in trouble and hide the details from the uke (his actual partner).

The uke bought some expensive tickets for an event and invited the seme, who cancelled last minute because he is helping his ex girlfriend.

It's not a cheating situation, just an idiot seme who can not communicate what is going on because he wanted to protect her privacy (or something like that?).

At the end the ex-girlfriend scolded the seme for not prioritising his actual partner.

It's a similar situation in Fukigen series, 3rd blcd but it's not the one I am looking for.

I think it is part of a series, not an stand-alone Blvd, but I might be wrong 😭 

If you have any clues, please help me!!